Estimate your child's puberty development stage based on age and gender. Understand Tanner stages and when to expect growth changes.
This calculator estimates your child's pubertal development based on the Tanner Staging System â also known as Sexual Maturity Rating (SMR). Developed by Dr. James Tanner in the 1960s, this system describes the predictable sequence of physical changes during puberty.
The calculator uses:
Important: This is an educational estimation only. Every child develops at their own pace. For concerns about growth or development, consult a pediatrician or endocrinologist.
Understand the typical sequence of growth spurts, breast development, voice changes, and other milestones that mark healthy development.
Recognize early or late onset of puberty. Early puberty (precocious) starts before age 8 in girls or 9 in boys. Delayed puberty starts after age 13 in girls or 14 in boys.
Knowing what to expect helps parents provide better emotional support and have informed conversations about the physical and emotional changes of adolescence.